[{"data":1,"prerenderedAt":122},["ShallowReactive",2],{"pages:en":3,"type:en:wood-straight":89},{"home":4,"types":8},{"title":5,"description":6,"h1":7},"Free 3D Stair Calculator with DXF Drawings | StairGen Pro","Free stair calculator for 16 stair types: steel, wood, spiral and concrete. Rise, run, stringers, comfort and code check, live 3D and DXF for AutoCAD.","Stair Calculator with 3D Model and DXF Shop Drawings",{"metal-straight":9,"metal-straight-toothed":14,"metal-l":19,"metal-l-toothed":24,"metal-u":29,"metal-u-toothed":34,"spiral":39,"wood-straight":44,"wood-cut":49,"wood-l":54,"wood-l-winder":59,"wood-u":64,"wood-u-winder":69,"wood-three":74,"wood-three-winder":79,"concrete":84},{"slug":10,"title":11,"description":12,"h1":13},"steel-stair-calculator","Steel Stair Calculator: 3D Model & DXF Shop Drawings","Design a straight steel stair with stringer and tread brackets. Get rise, run, bracket spacing, cut list and fabrication drawings in DXF for AutoCAD.","Steel Stair Calculator with Fabrication Drawings",{"slug":15,"title":16,"description":17,"h1":18},"sawtooth-steel-stringer-stair-calculator","Sawtooth Steel Stringer Stair Calculator | 3D + DXF","Calculate a straight steel stair with sawtooth (cut) stringers: rise, run, stringer layout and plate cuts, with a live 3D model and DXF shop drawings.","Steel Stair Calculator with Sawtooth Stringers",{"slug":20,"title":21,"description":22,"h1":23},"l-shaped-steel-stair-calculator","L-Shaped Steel Stair Calculator with Landing | DXF","Quarter-turn steel stair with landing: split risers between flights, check comfort and slope, see it in 3D and download dimensioned DXF drawings.","L-Shaped Steel Stair Calculator with Landing",{"slug":25,"title":26,"description":27,"h1":28},"l-shaped-sawtooth-steel-stair-calculator","L-Shaped Steel Stair Calculator: Sawtooth Stringers","L-shaped steel stair with sawtooth stringers and a square landing. Rise, run, stringer cuts and bill of materials, with 3D view and DXF for AutoCAD.","L-Shaped Steel Stair with Sawtooth Stringers",{"slug":30,"title":31,"description":32,"h1":33},"u-shaped-steel-stair-calculator","U-Shaped Steel Stair Calculator | Switchback + DXF","Half-turn (switchback) steel stair with a full-width landing. Calculate both flights, check comfort and export fabrication drawings to DXF.","U-Shaped Steel Stair Calculator (Switchback)",{"slug":35,"title":36,"description":37,"h1":38},"u-shaped-sawtooth-steel-stair-calculator","U-Shaped Steel Stair Calculator: Sawtooth Stringers","Switchback steel stair with sawtooth stringers: flight split, landing size, stringer cuts and cut list, with live 3D and DXF shop drawings.","U-Shaped Steel Stair with Sawtooth Stringers",{"slug":40,"title":41,"description":42,"h1":43},"spiral-staircase-calculator","Spiral Staircase Calculator: 3D, Dimensions & DXF","Spiral stair calculator: number of steps, rise, tread angle and walkline going from height and diameter. Live 3D and DXF drawings, free.","Spiral Staircase Calculator",{"slug":45,"title":46,"description":47,"h1":48},"wooden-stair-calculator","Wooden Stair Calculator: Closed Stringer, 3D & DXF","Straight wooden stair with housed (closed) stringers: rise, run, stringer board width and length, comfort check, 3D model and DXF for AutoCAD.","Wooden Stair Calculator (Closed Stringers)",{"slug":50,"title":51,"description":52,"h1":53},"stair-stringer-calculator","Stair Stringer Calculator with Diagram | 3D + DXF","Cut stringer calculator: risers, treads, stringer length, board size and layout diagram from your total rise and run. Free, with 3D and DXF template.","Stair Stringer Calculator (Cut Stringers)",{"slug":55,"title":56,"description":57,"h1":58},"l-shaped-stair-calculator","L-Shaped Stair Calculator with Landing | 3D + DXF","Quarter-turn stair calculator: total rise split over two flights, landing size, stringer lengths and comfort check, with live 3D and DXF drawings.","L-Shaped Stair Calculator with Landing",{"slug":60,"title":61,"description":62,"h1":63},"winder-stair-calculator","Winder Stair Calculator: L-Shaped Kite Winders | 3D","Plan a quarter-turn winder stair: winder angles, tread going, stringers and comfort check. 3D model and DXF drawings.","Winder Stair Calculator (90° L-Shaped Winders)",{"slug":65,"title":66,"description":67,"h1":68},"u-shaped-stair-calculator","U-Shaped Stair Calculator with Landing | 3D + DXF","Half-turn (switchback) stair calculator: risers per flight, landing width, stringer lengths and stairwell size, with live 3D and DXF drawings.","U-Shaped Stair Calculator with Landing",{"slug":70,"title":71,"description":72,"h1":73},"u-shaped-winder-stair-calculator","U-Shaped Winder Stair Calculator (180° Turn) | 3D","Half-turn winder stair around a newel: winder angles, walkline going, stringers and comfort check, with a live 3D model and DXF shop drawings.","U-Shaped Winder Stair Calculator (180° Winders)",{"slug":75,"title":76,"description":77,"h1":78},"three-flight-stair-calculator","Three-Flight Stair Calculator with Two Landings | 3D","Three-flight (three-quarter turn) stair with two quarter landings: flight split, landing sizes, stringers and comfort check, in 3D and DXF.","Three-Flight Stair Calculator with Two Landings",{"slug":80,"title":81,"description":82,"h1":83},"double-winder-stair-calculator","Double Winder Staircase Calculator | 3D + DXF","Three-flight stair with two 90° winder turns: winder angles, walkline going, stringer lengths and comfort check, with 3D model and DXF drawings.","Double Winder Staircase Calculator",{"slug":85,"title":86,"description":87,"h1":88},"concrete-stair-calculator","Concrete Stair Calculator: Volume, Rebar & Landing","Concrete stair calculator with landing: steps, waist slab, concrete volume and rebar weight, plus a 3D model and DXF drawings. Free.","Concrete Stair Calculator with Landing",{"type":90},{"intro":91,"choose":94,"how":97,"norm":101,"faq":103,"related":119},[92,93],"This wooden stair calculator is for the classic joinery stair: two board stringers with the treads housed between them (a closed or housed stringer, “closed string” in the UK) and, if you want, riser boards closing each step. It is the simplest stair to calculate and to build, and the reference for any single straight flight.","From the total rise (Y), the run available (X), the width (W) and the number of steps (C), the calculator gives the riser height, the tread depth and the pitch, checks the step formula and the building code limits (IRC/IBC by default, or Approved Document K, the NBC or the NCC), and produces a cut list of stringers, treads, risers and railing. The diagram is a full drawing set: the stringer sheet in the DXF shows where every housing goes, which is what a woodworking stair calculator with a diagram should give you.",[95,96],"Choose the straight wooden stair with board stringers when you want a classic joinery stair, closed at the sides: the treads are housed between two {T} mm stringers that hide their ends and stiffen the flight. It is the easiest wooden stair to make and to fit against a wall or between two partitions.","Compared with the cut-stringer stair, the treads sit between the stringers rather than on top of them, and the side of the stair is a plain board with no visible steps. With riser boards, each step also gets a closed riser, which makes the stair quieter and stops feet slipping through at the back.",[98,99,100],"The total rise Y = {Y} mm is divided into {risers} risers: {riser} mm per step. The run X = {X} mm is shared between the {C} steps, giving a run of {going} mm; with the nosing F = {F} mm the tread depth reaches {tread} mm.","Step formula: 2 × {riser} + {going} = {step} mm. Pitch: {slope}°. Verdict: “{grade}”. If the pitch goes above 40° the stair feels steep even when the step formula works out; the fix is a longer X or, if the opening allows no more, a stair that turns, such as an L-shaped or U-shaped stair with a landing.","The stringers are {T} mm boards and the treads {Z} mm. With Riser boards switched on, the closed risers are added as their own parts in the bill of materials; switch them off for an open-riser stair and the open gap appears in the Data tab.",[102],"For a straight flight, the codes mostly limit the rise, the going and the headroom. In the US, the IRC sets a maximum of 7¾ in (196 mm) of rise, a minimum of 10 in (254 mm) of tread and 6 ft 8 in (2032 mm) of headroom measured from the line of the nosings. In England, a private stair may have up to 220 mm of rise and a pitch of no more than 42°. Australia's NCC allows 115–190 mm of rise with a going of 240–355 mm, which is stricter than the UK on the riser.",[104,107,110,113,116],{"q":105,"a":106},"How do you calculate a straight staircase?","Divide the total rise by a target riser of 170–190 mm (about 7 in) to find the number of risers, round up, and share the run between the treads. Then check that 2R + G stays between 600 and 660 mm. For example, 2600 mm of rise over 14 risers gives 186 mm per step, and the going should then be between 230 and 290 mm.",{"q":108,"a":109},"How much space does a straight staircase need?","In plan, the run X by the width W, plus clear space at the top and bottom. Climbing 2.6 m (about 8 ft 6 in) comfortably takes roughly 3.3 m (11 ft) of run; if you don't have it, an L-shaped or U-shaped stair splits that length into two flights.",{"q":111,"a":112},"What is the 7-11 rule for stairs?","A rule of thumb for a comfortable stair: a riser of about 7 in (178 mm) and a tread of about 11 in (279 mm). Those are the IBC limits for commercial stairs, and they give 2R + G = 635 mm, right in the middle of the comfort range this calculator checks.",{"q":114,"a":115},"Closed stringer or cut stringer?","On a closed stringer the treads are housed between two boards, which hides the end grain and stiffens the stair; it suits interior stairs between walls. On a cut stringer the treads sit on top of notched boards and can overhang at the sides. Both use the same step calculation; the stair stringer calculator covers the cut version.",{"q":117,"a":118},"Open or closed risers?","Closed risers make the stair quieter and stop feet slipping through; open risers are lighter and let light through. Codes limit the gap: 4 in (102 mm) under the IRC and 100 mm under Approved Document K.",[120,121],"metal-straight","concrete",1791467609180]